Vetulonaia sp. (fossil clams) in pebbly sandstone (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 3 : 無料・フリー素材/写真
Vetulonaia sp. (fossil clams) in pebbly sandstone (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, Utah, USA) 3 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Vetulonaia sp. - fossil freshwater bivalves in the Jurassic of Utah, USA.The low-contrast, ~ellipsoidal structures at left in the rock are fossil freshwater clams at Dinosaur National Monument, Utah. The host rock is a pebbly sandstone - almost a conglomerate in places, but the pebbles are dominantly subangular in shape. The sandstone is most famous for its abundance of Late Jurassic dinosaur bones from sauropods, stegosaurs, and theropods. The whitish gray clasts in the photo are composed of mudrock ("mudclasts").The clams do not have their shells preserved - they are internal molds. Molds are a common type of fossil preservation style, consisting of impressions of the exterior or interior surfaces of hard part shells or skeletons.Classification: Animalia, Mollusca, Bivalvia, Paleoheterodonta, Unionida, UnionidaeStratigraphy: Carnegie Quarry Sandstone, Brushy Basin Member, Morrison Formation, Kimmeridgian Stage, Upper Jurassic, ~150 to 156 MaLocality: Carnegie Quarry, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA-------------------------------See info. at:en.wikipedia.org/wiki/Dinosaur_National_Monument |
| 撮影日 | 2013-06-09 19:26:09 |
| 撮影者 | James St. John |
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